Topic coverage measures what share of the search demand around a topic your page actually addresses, as a score from 0 to 100%. People search around any topic in many ways; your page answers some of those searches and not others. Topic coverage puts a percentage on how much of that demand the page speaks to - and it is the metric behind every Underperforming content recommendation.
Where you see it
Topic coverage lives in Opportunities, once RankDots has scanned your site. The coverage percentage appears across all Underperforming recommendations - how much of the topic a page covers is part of the picture for any page that underperforms. Wherever coverage is below 100%, the recommendation also shows the Missing keywords count against the topic’s total - in Expand content actions, for example - with the missing phrases listed under View SEO details.
How it works
Every keyword tied to a topic carries an importance weight - based mainly on how much search demand it carries, with a small default weight when no volume data exists. Topic coverage is a weighted share: the combined weight of everything your page addresses, divided by the total weight of all the topic’s keywords. High-weight keywords therefore matter more than low-weight ones - it is not a simple count of covered versus missing terms.
Whether a keyword counts as covered is decided by degree of match. An internal algorithm checks each of the topic’s keywords against your page’s keywords and assigns it a level - from a full match down to a loose, similarity-based one. For example, "email marketing" = "email marketing" is an exact match, "email marketing guide" vs "email marketing", is a 70% match, and "email campaigns" vs "email marketing" is the lowest semantic match. A keyword that clears any match level is covered and contributes its full or partial weight to the score. It is missing only if it fails every match level - then it contributes nothing, and it is these missing keywords that pull the percentage down and drive Expand content recommendations.
This is why the percentage and the missing-keyword count can look out of step: a page can be missing most of a topic’s keywords and still cover more than half its demand - or the reverse. Read the percentage as “how much of the audience this page can speak to”, not “how many boxes are ticked”.
When no page of yours covers a topic at all, that is not low coverage - it is missing content, and Opportunities raises a Create dedicated page recommendation instead of an expansion.
How to read it
Low coverage on a page that already ranks is the cheapest win in SEO. The page has proven it can rank; it just does not go deep enough yet. Adding the missing keywords gives it the depth to compete with pages that cover the topic more fully - that is exactly what the Expand content flow does. Recommendation: Expand content [link is coming] walks through it.
High coverage means depth is not your problem. If a well-covered page still underperforms, the limit is somewhere else - position, authority, or how the page is focused - and expanding it further will not move much.
Coverage is not a quality score. It measures whether the page addresses the searches, not how well. A page can mention every keyword and still be thin; expansion is worth doing only as genuinely useful content.
Read it together with Topic focus. Coverage asks how much of the topic the page covers; Topic focus asks how much of the page is about the topic. A page can score high on one and low on the other — and the fix is different in each case.
What next
- What is Topic focus?
- Recommendation: Expand content [link is coming]